Which of the following transport mechanisms require protein for the movement of substances?

In which type of transport is the mediation of carrier molecules specifically required?

Which of the following types of transport are included in passive transport?

In mass flow,various substances move independently according to their

This transport occurs along the concentration gradient.

Consider the following statements and choose the correct answer:
$I.$ Carrier proteins are needed by both facilitated diffusion and active transport and are sensitive to inhibitors that react with protein side chains.
$II.$ Different types of proteins present in the membrane play a major role in both active as well as passive transport.
$III.$ The carrier proteins needed by facilitated and active transport are specific.
$IV.$ There is no need of energy to pump molecules against a concentration gradient in active transport.
$V.$ Transport rate reaches a saturation point when all the active proteins are used.